Bristleback

A bad-tempered, foul-mouthed malcontent made meaner by his decision to become a Pretender. While entering Earth's atmosphere, he discovered that his armor was corrosive to rust! This forced him to don the monstrous outer shell, causing him to lose his quickness. The spikes on the back of his outer shell secrete corrosive acid on contact. Enclosed creature/robot is armed with rapid-fire, electrostatic pulse rifle.